/ baɪ; NAmE / exclamation , noun
■ exclamation
(also ˌbye-ˈbye , ˈbye-bye ) ( informal ) goodbye :
Bye! See you next week.
She waved bye-bye and got into the car.
Bye for now Dad!
■ noun
( sport ) a situation in which a player or team does not have an opponent in one part of the competition and continues to the next part as if they had won
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IDIOMS
see by
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WORD ORIGIN
noun mid 16th cent. (denoting a side issue or incidental matter): from by .